Electron-Selective SAM Formation Reagent for n-i-p Perovskite Solar Cells
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PANDI, an electron-selective self-assembled monolayer (SAM) formation reagent for n-i-p (direct) type perovskite solar cells,¹) forms an electron-selective layer on ITO. Devices using PANDI as the electron-selective layer with CsFAMAPbI3 as the perovskite layer have shown a power conversion efficiency (PCE) of 21.5%, among the highest reported for perovskite solar cells using organic electron transport layers or electron selective layers, and comparable to devices using tin(IV) oxide (SnO2). The high efficiency is attributed to the relatively uniform SAM formed by PANDI on the ITO surface and its high electric dipole moment, which enables efficient charge extraction and suppresses non-radiative recombination at the interface. PANDI can form the electron-selective layer by annealing at 100 °C, making it applicable to flexible substrates. This temperature is lower than the around 150 °C typically required for SnO2, a recently popular low-temperature processable electron transport layer.²) For example, a PANDI on ITO-PET device showed a PCE of 17.7%. PANDI is also supplied as an isopropyl alcohol adduct, which can be used in the same manner as PANDI itself.
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References
- Nonfullerene Self-Assembled Monolayers As Electron-Selective Contacts for n-i-p Perovskite Solar Cells. D. S. Utomo et al., S. De Wolf, ACS Energy Lett. 2024, 9, 1682.
- Tin Oxide Electron-Selective Layers for Efficient, Stable, and Scalable Perovskite Solar Cells. C. Altinkaya et al., S. De Wolf, Adv. Mater. 2021, 33, 2005504.
Source
- TCI Product Highlights: www.tcichemicals.com/ID/en/product/tci-topics/ProductHighlights_20250203
- TCI product page P3307: tcichemicals.com/ID/en/p/P3307
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